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Monthly climate in Ulsan, South Korea

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Ulsan features a humid subtropical climate (Cfa). Temperatures typically range between 3 °C (37 °F) and 27 °C (81 °F) through the year, but rarely can drop to -12 °C (11 °F) or can rise to as high as 36 °C (98 °F). The average annual precipitation amounts to about 1289 mm (50.8 inches) and receives 94 rainy days on the 1 mm (0.04 inches) threshold annually. Ulsan enjoys an average of 3178 hours of sunshine throughout the year, and daylight varies from 9 hours 47 minutes to 14 hours 29 minutes per day.

Monthly average temperatures in Ulsan, South Korea

The warmest months in Ulsan are July, August and September, with daily mean temperatures ranging from 22 to 27 °C (73 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 4 °C (37 - 40 °F) throughout the day. On average each year, Ulsan experiences 88 days above 25 °C (77.0 °F) and 54 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ulsan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum16°C
(62°F)		23°C
(73°F)		22°C
(73°F)		26°C
(80°F)		33°C
(92°F)		32°C
(90°F)		36°C
(98°F)		36°C
(98°F)		30°C
(87°F)		30°C
(85°F)		22°C
(72°F)		18°C
(64°F)
Mean maximum14°C
(57°F)		17°C
(62°F)		21°C
(70°F)		25°C
(77°F)		30°C
(87°F)		31°C
(88°F)		33°C
(92°F)		35°C
(94°F)		29°C
(85°F)		27°C
(81°F)		22°C
(71°F)		16°C
(60°F)
Average high7°C
(45°F)		9°C
(49°F)		14°C
(58°F)		19°C
(66°F)		23°C
(74°F)		26°C
(78°F)		29°C
(84°F)		30°C
(86°F)		25°C
(78°F)		21°C
(70°F)		16°C
(61°F)		9°C
(48°F)
Daily mean3°C
(37°F)		4°C
(40°F)		9°C
(49°F)		14°C
(57°F)		19°C
(66°F)		22°C
(72°F)		26°C
(78°F)		27°C
(81°F)		22°C
(73°F)		17°C
(63°F)		11°C
(52°F)		4°C
(40°F)
Average low-1°C
(30°F)		-0°C
(32°F)		5°C
(41°F)		9°C
(48°F)		14°C
(57°F)		18°C
(65°F)		23°C
(74°F)		25°C
(77°F)		20°C
(68°F)		14°C
(57°F)		7°C
(44°F)		-0°C
(32°F)
Mean minimum-8°C
(18°F)		-7°C
(20°F)		-1°C
(31°F)		2°C
(37°F)		8°C
(46°F)		15°C
(59°F)		20°C
(67°F)		21°C
(69°F)		15°C
(59°F)		6°C
(43°F)		-0°C
(32°F)		-6°C
(21°F)
Minimum-12°C
(11°F)		-9°C
(15°F)		-2°C
(29°F)		2°C
(35°F)		6°C
(43°F)		13°C
(56°F)		17°C
(63°F)		19°C
(66°F)		13°C
(56°F)		5°C
(41°F)		-2°C
(29°F)		-9°C
(17°F)

Compare climate in Ulsan with other places

Compare temperature, precipitation, sunshine, UV index in Ulsan, South Korea with other places around the world.

Monthly average precipitation in Ulsan, South Korea

Ulsan usually has the most precipitation in July, August and September, with an average of 13 rainy days and 226 mm (8.9 inches) of precipitation per month. The driest months in Ulsan are January, November and December. On average, 25 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ulsan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)32 (1.2)39 (1.5)86 (3.4)87 (3.4)80 (3.1)144 (5.7)244 (9.6)199 (7.8)236 (9.3)100 (3.9)21 (0.8)23 (0.9)
Average precipitation days (≥ 1 mm)3487810141512733

Monthly sunshine hours in Ulsan, South Korea

The sunniest months in Ulsan are May, June and August, when the sun shines an average of 9 hours 54 minutes a day. Least sunny months in Ulsan: January, February and November receive an average of 7 hours 30 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ulsan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours196241271284307306283298247258237244
Mean daily daylight hours10h 3m10h 53m11h 58m13h 5m14h 1m14h 29m14h 15m13h 26m12h 22m11h 15m10h 17m9h 47m

Solar UV radiation in Ulsan, South Korea

Ulsan experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Ulsan UV Index data.

Average daily maximum UV levels by month for Ulsan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)357101011121210753